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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a1589e2c5cc249a7746da21e5e27615a56e08a90c042df6b8f428d9d3c18448' 
  AND token = 'wrJiYVsKRi1vO31+r1xYBN4vBxWTfmruit+BEWFbL48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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