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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecac3e1f934c9e02d3fd0e15f7a84beb1ac43aeee6d9d8be169a48f90121c3da' 
  AND token = 'lBVdkH4axaTecgxKM8Ees6pJLGxgxfy1A+/GVrpssQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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