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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adff498fab535a954594d261f942d597435a008131eb0286133fa2cd91c0b7a5' 
  AND token = '50aVfDKL3684Jc7xHkCnS6zxKlcyWAUrlaJdR9/uk4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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