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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c84778d042dfe94c256ac4d6d2d32c5ace4410ad7f0f7968923142c541fc9f7' 
  AND token = 'vA6lPv6y1TzwkdAo58vJc3NXEtWGbIafOOnypxA1xfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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