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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dacba6b72571d96d08065c074c1ed11869da02d739a17dc721ded30d3ee99e6' 
  AND token = 'k9jWH41MAMlc1Xqgtgff9UMm+H80ym3kX7aK7QogTlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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