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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd30cd97d797aa47f049d6711f0f3b95c87039aeec3322a79a8352c56011854f' 
  AND token = '4XPl3A29LS31vTB5sh6bTzDEuwz2Rw6yDt7Q6vHM15M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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