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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33586c5dc1c70e7303b2bf02eb044a9132d2dba91151bdd5e705da82b8090d7b' 
  AND token = 'xuK0fwUPXCLOYu+J2aDrY+8HWMOgx8Bvx1CHeTwAXms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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