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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '487eea2e421e9c5d4c65bc9f603da07075e016f7e68efba445b9774471386b1c' 
  AND token = 'Dnk04lJVFaogkfXM9dEFvooaQYZ8HL3wJ7CpmUU/tb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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