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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cd6f7823d5fbd2d306bc0c9eaadfb7503de9c9016bba407177670db4c9dce50' 
  AND token = '0o6jzEpvQvp9codGXWL4i4p2Hg4u4R/fedbSNz6D6SQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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