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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34d3ea08ac615a2f99233a3be1fd23c56c4b240d0f947c4466ade520fd44d29d' 
  AND token = 'obJW9cwfG59HHLp1cQ2AyqVIq+LECEjV7X13cGaQ8vQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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