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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e976befca8bcd4626cc03c7d064ec230215fe6a0bbb4f9ebee68f738a62ae1c4' 
  AND token = 'H7tOkG4iVkIudkppt84jYomVmQdO7F2tw42UTmKYCe8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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