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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73eb2428e92534621ce3d07c73e92177c045ca96d85ae4db41072f3ea209444a' 
  AND token = '0ij8w2DdQYDBWyU/AWXyurd23OrDEXH3HGET49xc6UA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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