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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a467315ddb7a4d749e57745b7b20459540947a7748eec8cf077f21763398c037' 
  AND token = 'dqc/nLfzzeTwdGSzV3AfQSKuvrsUmJk3+dVK3uxu3B8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00089

JSON explain

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