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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7dc341908055b0b4481c0b60209a29c86cb3a3eb98f52187c98dee449fb35a5' 
  AND token = '1U4WzYzaI+bnvE/EwVPagLugqShj2R9mMi1tatsuvn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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