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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '287b2dc5716e9ddaa2fd0bb1bce031834b37f2b8b1d5cd78a8fc2ac1ec92872f' 
  AND token = 'XFQR+ry2Gw9gtyB0TwrjvEuwyJ3tqWdQE7ERnfucLIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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