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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10aba2b74de96fa06b272310ab039a8be2d3ae603679de5fd68ba9788dd2d690' 
  AND token = 'wYdyHs8bp1/Ie42EYR7f4b+28nC2GTojQBf8hPEvX4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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