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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8858e60142beffff5812b3518433faf95b620b22d810e3fabe7cf3a2cf9d6a14' 
  AND token = '64PSokD/7x931mHEVAIZ+cYX3lecqSQ0/Nb3fGtMG8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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