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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8986787d361e3004328b29db04e3c1fa3b507db8a10f14ee7c0fa28baa85d25' 
  AND token = 'PyY9YraR3tx9i8sd3ha9BHX8L1TXZxd7lKy13sXCIDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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