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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3262e07cdcaf6c439bd3ff84a9b0ae158853f9990459d9af2c6882d06708fd9' 
  AND token = 'b7GFxo51rCmPCG8FyYr1sAAL6Z+wZN2OdqJPmk/YrSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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