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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd730db12e27a00c14348b76a36daf507f684d24df5b3ed49ac0b71d090f87593' 
  AND token = '3o3KNEreZBz52mlHkGxTg4dm2Aj7c5Mb4w327JTcU/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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