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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7588e5b8f8d41e653d4c0ae434f648450da8233d84503eb76b198f72814595d' 
  AND token = '87kQzHxIxh3Jn8YU4ocfbVoxnl9c2pu8fJWT4MScECY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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