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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdb9fcfcf042d176a4d72d92ea71230351146547ba53e5f16ebb9fc0282f8aac' 
  AND token = '2PbcYGGt0ylHXmGcCckYASVA1gRQ2YtQadq9l7ZGmK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00079

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}