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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cf17f916f7f0ab2b35fdfff810dcff0773c1dd9f0874afc721c2b186a37f71d' 
  AND token = 'vbv42GubC1lnFNn8pwXknygqi1nF580JNMdP/v358Cw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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