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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dc26a9b64b2215be9aff254774999fb62cd9f654a5da235a19b325bae18154f' 
  AND token = 'SehT4glYu7zpBrlw3HSX01DWbo9eAod4caVte4rdqhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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