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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14ff72869acfd39820dd1ee5208590286af3943b77feeb83b5468db330caa04e' 
  AND token = 'IgpE5m8lDOQ+J45AZ06DdiuNp/rYrWiAKNS1Vzp6UIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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