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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7c92567e4ff7e9e822b4cc27424bf25b946d43033c08f0243fcfb9a0e2d4368' 
  AND token = 'mPfVzf21cia3qsgzz/7mnse4JqvnOR97OWRo/iiDcns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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