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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b95ecc4dce2cd5618a8b5b1537ac206f5da320b20673a33669b978c92c065cae' 
  AND token = '8lrEzPBMnsse8aw58QOjSfaFEGXgZbpeq02ggM/694k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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