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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c91c6db949135d0c22584804cada93c0383ec24c096a7143a63f471dfc05f4ba' 
  AND token = 'fKwYW2adh4gvZatcdK4hvsO0R1H7AcynHmCu28OsOAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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