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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a77c11f3d036ae3db90e7a399298ce934bbe27b92d0a351aa7c1272e8adeceb7' 
  AND token = 'W3g3O0F1uhRycDLWXHhWwkO5V8/+0CNZmviOL9ZgQTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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