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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74e3ca85f62163193f0cb786123f18a7024eeb8c1e15db30b4c3d5cea822b944' 
  AND token = 'A7vspEhiMmajeycsKYWiodoFoeK3SkojNNS2Sxc6ocs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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