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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6ee2a602db7a5e166cf5a1fc55055e9c93bceccc05cf70147f72442ab7fb6c1' 
  AND token = '7LcdSjxfrz7WY7g7oeWyAo4lkJSwEuvFmPaP9UH0Vdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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