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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5537556ffdc7e1349afc67fa4aadc29d8d4634b3b1bb0394c082479dd978a38' 
  AND token = 'i/rC2unWLqNca4K51IrreoBqyOZIHOWW8B/Ho/OSdN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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