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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f5a3a49494e412e9b469884a9a82d3a276a97d40043b2e70138997259aa033b' 
  AND token = 'mjqZZ9DD+X9v/VgUyiy5l5H/yUXb7PfooECO0GVeDqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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