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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd58ae99d8d9774940a9925b8d4a433584f0d652cde7331e7b0d1360e4124419d' 
  AND token = 'tO4pRTmWLJNWMVQc9rgxfHbl9i89bJ9eC23gHu7Cy2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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