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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f832400fcbd6a5b56e8b972f6a1a4e5a0495e50636fe7f035b402117a29d546e' 
  AND token = 'g/EBBW7abKHmLG6erOaNdKE8kJQ27H7mqLdjzdnASWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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