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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef09c208c0babae663cf801b460cf6cff013813a439c3543a98c5e51ffa01550' 
  AND token = '/KmNhHO6SxECRa0S9GkEpi3GV6Dhlmjfr4pOArEildI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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