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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd847677603d2631e328c11a9a12a25169ea8ff65fd5aa97418606144ae6c4a5b' 
  AND token = 'kNmOlgI7T9XaofzE4S2pvo08FJfNg5L0eP9dFTOc7sY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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