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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98eb0fe3a27683b6a7d7f8ea19480139939f7d481769e5f3e6dfb03ee8450137' 
  AND token = 'nnKYARILoCaRRNUcvOudvYK2us/oviakOod2S8TZ+F8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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