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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '213b4124dfa8d934f44c533b21ebff7ba74cba8009add2d4c6bcdb1ccb29cd57' 
  AND token = 'pDcibKD4S/Zv8Ly8xVlxRLqv/sn1bWgEhNPSPk2KVMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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