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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a8e2734a550ed4cdca74fa346b5e1040fe7bc7783bcab871229a3f71d3a2061' 
  AND token = 'WcRii+NiZS9rzqYQOObErY33oti+I5JzrdwpQPkClgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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