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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f634a818bda80584c277537559956a4be04b47bb47afef87c9a2f8b5a267fcdb' 
  AND token = '4LS64Qblt4dMr2CFzqk17p36KJ0W17d8pHwOIGBBbLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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