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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c9d5cf1ba9fb11843710bc209b8974ceece326e1b468249a1320f92e25b3e6b' 
  AND token = 'QjkdC924QUoguPvF0q36yn3pkfp98LP3h9lpwBOMHDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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