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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd694c9d11c1468c18f0602fd638142c4569fc88c563d6bdcfc126327e8fcf9f' 
  AND token = 'KhT6IbY/NUlIgpo8OXiRzbxeqxzp3LPx3DEealYzQUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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