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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b349648aac0abaf65d948d4d6477e161e70eab4f9af1749414c7965cb87a7187' 
  AND token = 'MnQ2DkDk84kHbjgzz50ym51AhqhfX+WGZC117p12+8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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