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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c35fe3e574956b6a9ee2befffdae8f9833118d272e52dbbd65a78bfdf3aaa5c' 
  AND token = 'eOIX4RY9aO++eOLtoWsWl5E0IncaG2/jHUsH/LaPnT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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