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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d9b77f498c4066511e0a53f36d2ae8e49a42d874ce25da7ccbb55179f830e35' 
  AND token = 'hVscV3lhfF2ihTLXGoL3ufOGCMSdVkaDwIUUxmPXt9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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