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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8930f1f5725e1b5b1d3d06cc6bcd4d6732512fea27057b8d4f7d9db9601652a8' 
  AND token = '7ebRgJWtLld0RFJiGLHlN35kkVzs9YxDUIn4p43wxjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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