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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2be77f4106c82e834ba8f5ec91d0c26c6d714dc58f9a9bbfe02764b5d61c9dd' 
  AND token = 'xfq2RiVpT6yWhvZSXuARfQAjLovohaQwyd0lQLzaCRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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