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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56e6832584821a85e5dfea63e8c7ed762f201e5637d54b5bcc8f2ccedf0b32ea' 
  AND token = 'w/o3vdvmspFAs8s2iO9zWpPkF0NWQ4GereLv5J7Xz8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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