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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7e13c7c24a8fe76682a134f8223bd75491de8e5fbf4aa5b222933aff67ca547' 
  AND token = 's6y6rxYtoB5gEv12J/0au5PXrYJdByHaKzyRFYgkg64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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