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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96eed225036a23a30865fec7c1fbfe3e0c0b3efdd07779f4a00b1e30ea39a17d' 
  AND token = 'A92bqJLTL5szapQJRQluLBqNEnQFYz7qGwlrYrGDiYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00072

JSON explain

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