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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '098ced59e8cda698cef1366e547b635afb54bf1cfd68bfcc098dded61f3c874c' 
  AND token = 'lnrVP5IY0dvO2q4IZ0e5wJxisqfqA2YmBHFeieIk1UY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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