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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc413a0b92545e8a1fce92067a8f4880d0d9218374f62b1692816088ec50867e' 
  AND token = '8nJiVv6sqXzR0DTsSecMN+CSjw2/d4ckkK0RTghBkcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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