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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b760b8c7d33cd0e2c6c5a362f263d71a325dc81df6e1558f21d75bebf1347c8a' 
  AND token = 'n2PMekwMNVz/djEhVRWUXq0ZEPehFyCG3RuqvXDiq9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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